Gas flushing brick for metallurgical vessels

Abstract

In a flushing brick for metallurgical vessels comprising a shaped brick having a gas distributor connected to a gas supply pipe and gas passages the gas passages lead out of a wind box and are surrounded in a gas-tight manner by a protective tube that keeps the outer part of the shaped brick free from the pressure of the flushing gas.

What is claimed is: 
     
       1. A flushing brick for metallurgical vessels comprising a shaped brick of refractory material having a wind box connected to a gas supply pipe and gas passages, wherein the gas passages lead from the wind box and are surrounded in a gas-tight manner by a protective tube arranged in the refractory material so that the gas passages are also directly surrounded by the refractory material. 
     
     
       2. A flushing brick according to claim 1 wherein the wind box has a substantially smaller diameter than the shaped brick. 
     
     
       3. A flushing brick according to claim 1 wherein the wind box and the protective tube have the same diameter. 
     
     
       4. A flushing brick according to claim 3 wherein the lower part of the protective tube forms the box. 
     
     
       5. A flushing brick according to claim 1 wherein the protective tube extends beyond the centre of the shaped brick. 
     
     
       6. A flushing brick according to claim 1 wherein the gas passages are slit-shaped. 
     
     
       7. A flushing brick according to claim 6 wherein the major transverse axis of the gas passage runs radially with respect to the protective tube and there is a core of refractory material between the gas passages. 
     
     
       8. A flushing brick according to claim 1 wherein the shaped brick is conical in shape. 
     
     
       9. A flushing brick according to claim 1 wherein the shaped brick is surrounded by a sheet metal jacket. 
     
     
       10. A flushing brick according to claim 1 wherein the base of the shaped brick rests on a sheet metal disc.